solve the following ...
1) Find the sum of 4+12+20+- - - - - - - - - - + 100
Answers
Answered by
3
Answer:
676
Step-by-step explanation:
(4)+ (4+8) + (4+8+8) ............+(4+8+8+8+8+8+8+8+8+8+8+8+8)
[4+8(0)] + [4+8(1)]+[4+8(2)].............+[4+8(12)]
So the total terms are = 13
So,
Sum = 4(13) +8(0+1+2+3.....+12)
= 52 + 624 = 676
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